{
    "code": "84450",
    "coding_system": "CPT",
    "canonical_url": "https://localishealth.com/cpt/84450/2014/B",
    "release_specific_url": "https://localishealth.com/cpt/84450/2018/C",
    "description": "Measures aspartate aminotransferase, an enzyme that sits inside liver cells but is also plentiful in heart and skeletal muscle. When those cells are damaged the enzyme spills into the bloodstream, so a raised level flags tissue injury without pinning down the location. It is almost always interpreted next to ALT, its more liver-specific counterpart, and the ratio between the two carries its own meaning.",
    "answer": {
        "question": "Did Medicare pay separately for CPT 84450 in Q3 2018?",
        "text": "Not at a published national rate. CPT 84450 carries status X (statutory exclusion) in the Q3 2018 release. The statutory definition of physician services does not include this item. Treat the blank amount as unpriced, not as $0."
    },
    "release": {
        "schedule": "pfs",
        "year": 2018,
        "quarter": "C",
        "label": "Q3 2018",
        "effective": "July 1 – September 30, 2018",
        "revision": 1
    },
    "status": {
        "code": "X",
        "non_facility_payable": false,
        "facility_payable": false
    },
    "national_rates_usd": {
        "office_non_facility": null,
        "facility": null,
        "sequestration_applied": false,
        "gpci": 1
    },
    "rvus": {
        "work": null,
        "practice_expense_non_facility": null,
        "practice_expense_facility": null,
        "malpractice": null
    },
    "formula": "(work_rvu × work_gpci + pe_rvu × pe_gpci + mp_rvu × mp_gpci) × conversion_factor",
    "conversion_factor": 35.9996,
    "source": {
        "label": "Physician relative value file (Q3 2018)",
        "cms_url": "https://www.cms.gov/medicare/medicare-fee-for-service-payment/physicianfeesched/downloads/rvu18c1.zip",
        "local_source_url": "https://localishealth.com/sources/physician-fee-schedule/2018/C",
        "file": "PPRRVU18_JUL.csv",
        "row": 14122,
        "sha256": "514e3c115f8e62a35eb5f78fef7ed12ed7b60b22a5fe3f3f1bb5aadf119663c5"
    },
    "modified_at": "2026-08-04T03:08:27+00:00"
}